tion to his plan of albumenizing paper: although we
felt some doubts whether it did not contain the disadvantages which our
correspondent now points out. We had met with such complete success in
following out the process recommended by DR. DIAMOND in our 205th
Number, that we did not think it advisable to make any alteration. For
our own experience has shown us the wisdom, in photography as in other
matters, of holding fast that which is good.--ED.]

_Stereoscopic Angles._--Notwithstanding the space you have devoted to this
subject, I find little practical information to the photographer: will you
therefore allow me to presume to offer you my mode, which, regardless of
all scientific rules, I find to be perfectly successful in obtaining the
desired results?

My focussing-glass is ruled with a few perpendicular and horizontal lines
with a pencil, and I also cross it from corner to corner, which marks the
centre of the glass. These lines always allow me to place my camera level,
because the perpendicular lines being parallel with any upright line
secures it.

Having taken a picture, I note well the spot of some object near the centre
of the picture: thus, if a window or branch of a tree be upon the spot
where the lines cross [Cross lines], I remove the camera in a straight line
about one foot for every ten yards distance from the subject, and bring the
same object to the same spot: I believe it is not very important if the
camera is moved more or less. This may be known and practised by many of
your friends; but I am sure others make a great difficulty in effecting
those satisfactory results which, as I have shown, may be so easily
obtained.

H. W. D.

_Photographic Copies of MSS._--I am glad to find from your Notices to
Correspondents in Vol. viii., p. 456., that the applicability of
photography to the copying of MSS., or printed leaves, is beginning to
excite attention. The facility and cheapness of thus applying it (as I have
been informed by a professional photographer) is so great, that I have no
doubt but that we shall shortly have it used in our great public libraries;
so as to supersede the present slow, expensive, and uncertain process of
copying by hand. And it is in order to help to bring about so desirable a
state of things, that I send these few lines to your widely-circulated
journal.

M. D.

* * * * *

{502}

Replies to Minor Queries.

_